Has there ever been a handier mini anything than a hot glue gun? OK, don’t answer that, but we’ve noticed that even the tiniest iterations of this crafting tool are getting more sophisticated all the ...

If you’re building a 3D printer, the most complicated part is the extruder. This part uses a series of gears to pull plastic filament off of a spool, heats it up, and squirts it out in a manner ...